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Best Answer: In USB 3.0, equipment and the host computer to a more harmonious cooperate, also known as a key research direction. On the inheritance of USB 2.0 core architecture based on double bus, how to use the advantage of mode, how to allow the user to directly experience to USB 3.0 than USB 2.0 advanced, became the key: when needed to provide more power USB 3.0 to provide 50% - 80% more power to support those who need more power driven equipment, and those by USB charging equipment, adumbrative can faster completion of charging. The new Powered-B interface by an additional 2.0 lines, up to 1000 Ma power support. Can drive the wireless USB adapter, and get rid of the traditional USB adapter connected by cable necessary. Usually a wired USB device needed to connect to the hub or the computer itself, while high power support, do not need a " line " exist. Need not automatically when the conversion to USB 3.0 reduced power consumption, power consumption is also to be considered a very serious problem, so the effective power management is very necessary, can guarantee the equipment idle time reduction of power consumption. A large stream of data transmission needs faster performance support, at the same time transmission time, idle equipment can be transferred into a low power state. Can even air down to receive instruction, and perform other actions. In fact, in the USB 3.0 also not everything changed, such as the length of the cable. When in certain applications require the highest possible throughput time, often cable will become a bottleneck. While the USB 3.0 specification, is not explicitly specified how long USB cable, but cable material and quality of signal transmission effect or influence. Therefore in the transmission of hundreds of mega data stream, the cable length should not exceed 3.0 meters. In addition, some support for " SuperSpeed USB " hardware products, such as the hub ( hub ) may be more expensive than USB 2.0, it is now active and passive power supply power supply hub for a reason. Because a real sense of " SuperSpeed hub " should have 2.0 kinds of interface, a " SuperSpeed hub " to play a real role to play, another common high-speed hub role.And the 3.0 transmission rate is much higher than 2.0, basically about 3.0 times more than ordinary mobile hard disk.USB 3.0 and 2.0 interface, downward compatibility, but the USB 3.0 interface are different in color, usually blue, so now you see if interface or USB device is such that, is the basic of USB 3.0

The secondary difference is power. USB3.0 can supply much more power over its interface than what USB2.0 can. Therefore, the range of purely USB-powered devices opens up, as there's more power to play with. Bigger and faster hard drives can now be purely USB-powered rather than needing an external power supply.

The tertiary difference is protocol handling of endpoints. USB3.0 has improved bus usage (among other things, it has done away with polling in the protocol and implemented an asynchronous message system), and it allows a greater number and variety of devices connected to the endpoint.

It takes the possible throughput from USB2s 35 - 45 megabites per second max up to over 600 MByte/sec (assuming the connected device can run at whatever speed - a slow device will be slow on any connection).

1.Transfer rate of up to 10 times faster than the USB 2.0 version and has been dubbed the super speed USB.
2.Offers a throughput of up to 5.0Gbps when used with a USB 3.0 host and device, an astounding 10x the capability of USB 2.0 (480Mbps).